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diff --git a/src/output_string_crope.h b/src/output_string_crope.h
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+// Copyright 2008 Google Inc.
+// Author: Lincoln Smith
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// Contains a class that demonstrates how to specialize OutputString for the
+// crope type, so that cropes can be passed as output arguments to the encoder
+// and decoder.
+
+#ifndef OPEN_VCDIFF_OUTPUT_STRING_CROPE_H_
+#define OPEN_VCDIFF_OUTPUT_STRING_CROPE_H_
+#include <config.h>
+#ifdef HAVE_EXT_ROPE
+#include <ext/rope>
+#include "google/output_string.h"
+
+namespace open_vcdiff {
+
+// *** OutputString interface for crope (OutputCrope)
+
+// crope::reserve(), if defined, does nothing
+template <>
+void OutputString<__gnu_cxx::crope>::ReserveAdditionalBytes(
+    size_t /*res_arg*/) { }
+
+typedef OutputString<__gnu_cxx::crope> OutputCrope;
+
+}  // namespace open_vcdiff
+#endif  // HAVE_EXT_ROPE
+#endif  // OPEN_VCDIFF_OUTPUT_STRING_CROPE_H_